Firewalla Gold vs EnvisaLink board
I recently upgraded to Gold. For the most part things are going smooth, but I am chasing some gremlins. One such gremlin is my EnvisaLink board. This is an interface to a home alarm system. It stays connected to the "home office" and, among other things, alerts me when contact is lost (i.e. internet or power is out). This has been working for years without an issue. Since upgrade to Gold, however, I am getting alerts that it is offline for sometimes hours at a time - there are 16 alerts in the last 24 hours alone. I am not seeing any blocked connections - and even tried to set the device as unmonitored - nevertheless, it keeps happening. Any ideas what is happening?
Summary:
* It is a wired device.
* It seems to talk to a specific DNS name on a specific UDP port. (at least that is what the "flows" say)
* Looking at the "flows" history it shows a single "flow" that says 17 "flows" once opened (???) . Given the correlation to 16 disconnects - perhaps, each is a session that was interrupted, but all are listed with a single timestamp, so it is impossible to know if this is the case.
* There are no rules for this device. I tried moving it to different device group or even disabling monitoring - no difference
* This started within an hour of upgrading to Gold - so I am relatively sure there is a connection
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I have not changed my network much, just replaced google wifi with firewalla, with firewalla taking over my old subnet and Google Wifi getting a new one (as per instructions) . The device was still setup same as before:
Envisalink -> dumb switch -> managed switch -> firewalla
Since then I reset the Envisalink (that should put it in DHCP mode) and removed the dumb switch (connecting directly into the managed switch). The managed switch sees its mac address on the right port and negotiated 100Mbit full duplex connection - but it does not appear the device is getting an IP from Firewalla - (even though I have it reserved) - Would be nice if there were some logs or something, but i cant find them in Firewalla :-( -
Well, I am starting to feel like it is a DHCP issue. Looking at the tcpdump it looks like Google Wifi and Firewalla are duking it out - even though Google Wifi does not have any IPs to issue . I see a ton of "gwifi_rouge_dhcp_detection", "wrong server-ID", AND "wrong network" DHCP broadcasts.
I switched the EnvisaLink to a static IP and it seems to have stopped having issues (too soon to tell if it is permanent, but it feels much more stable) Not sure why this affects specifically this device, but I have not seen major issues with other devices (yet)
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